First Generation Ascots > Tech Section

Motor locked up on freeway

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scottly:
What do you mean the spark plug is dramatically different?? Can you post a pic?
You may have "soft seized" the motor. What can happen is the piston expands from heat enough to lock against the cylinder, then after cooling off, it frees up. This happened to a friend of mine, and was due to low oil level, while pulling a long grade at 65+ MPH. He was able to add some oil and make it the remaining 40-50 miles to home, but ended up needing a re-bore and new over-size piston.
You should do a proper compression test before messing with the ignition system.

triguyracer:
Sure sounds like it seized up ,once the motor cools some,then many times it will turn over and you are abile to restart it,once it gets some heat it will seize again if that was the problem in the first place.If you can pull the clutch in and it disengages the rear wheel you can almost be sure it was some kind of seizure ,the piston or some thing in the gearbox,your best bet is to get a acurett compression reading that will tell you a lot,am I reading this right when you said it locked up did you skid off the road before you pulled in the clutch ?

scottly:
We seem to think alike, triguy. ;D

triguyracer:
Yes you nailed it just what I thought too, seized up way to many motors in my time racing ,thankfully only cost money and not any broken bones and such lol

NinjaFinch:

--- Quote ---What do you mean the spark plug is dramatically different?? Can you post a pic?
--- End quote ---

I'll try, but I also won't have a before pic for comparison FWIW.

Edit to answer the question: I remember testing it last month when I took it out of storage, and it was more of a bright violet colour. It's a dull orange if I test it now.


--- Quote ---when you said it locked up did you skid off the road before you pulled in the clutch ?
--- End quote ---

Sort of. I didn't think to pull the clutch in before I came to a stop. It was while I was trying to get it to the side of the road that I pulled the clutch in and it rolled fine.


--- Quote ---You should do a proper compression test before messing with the ignition system.
--- End quote ---

For sure, it's going to get done regardless. But since it's not going anywhere while I track down an adapter, I figured I might as well tackle the ignition while I wait. Two birds, one stone, right?

Actually on that note, I did the full pinpoint test late yesterday and here's what I've found:

Spark plug - brand new, gapped correctly, produced dull orange spark when cranking

Coil/Wire - tested primary coil at 0.8Ω (nominal 0.2-0.8Ω) and secondary coil at 10.5kΩ (nominal 8-15kΩ)

CDI box - produced a 6V signal to the coil (nominal voltage is 36-42V, according to J6G1Z's test thread), box was grounded properly

Pulse generator - tested at 498Ω (nominal 513-567Ω), out of limits but not sure to what effect

Alternator - tested white stator wire at 299Ω (nominal 259-351Ω), tested blue stator wire at 386Ω (nominal 73-99Ω), did not test the yellow terminals

Regardless of whether I have compression or not, I feel like a bad ignition stator isn't helping. More to follow when I can get a proper reading.

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